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<?php |
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declare(strict_types=1); |
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namespace Arp\EventDispatcher\Listener; |
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/** |
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* @author Alex Patterson <[email protected]> |
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* @package Arp\EventDispatcher\Listener |
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*/ |
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class ListenerCollection implements ListenerCollectionInterface |
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{ |
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/** |
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* The collection of listeners to iterate. |
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* |
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* @var \SplPriorityQueue|callable[] |
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*/ |
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private $listeners; |
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/** |
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* Internal count for the queue priority order. |
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* |
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* @var int |
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*/ |
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private $queueOrder = PHP_INT_MIN; |
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/** |
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* @param iterable|callable[] $listeners |
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*/ |
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public function __construct(iterable $listeners = []) |
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{ |
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$this->listeners = new \SplPriorityQueue(); |
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if (!empty($listeners)) { |
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$this->addListeners($listeners); |
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} |
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} |
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/** |
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* Add a collection of listeners to the collection. |
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* |
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* @param callable[] $listeners The collection of event listeners to add. |
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* @param int $priority Optional priority for the listener. |
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*/ |
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public function addListeners(iterable $listeners, int $priority = 1): void |
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{ |
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foreach ($listeners as $listener) { |
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$this->addListener($listener, $priority); |
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} |
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} |
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/** |
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* Add a single listener to the collection. |
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* |
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* @param callable $listener The listener that should be attached. |
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* @param int $priority Optional priority for the listener. |
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*/ |
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public function addListener(callable $listener, int $priority = 1): void |
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{ |
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$this->listeners->insert($listener, [$priority, $this->queueOrder++]); |
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} |
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/** |
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* Return the listener iterator |
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* |
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* @return \Traversable |
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*/ |
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public function getIterator(): \Traversable |
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{ |
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$clone = clone $this->listeners; |
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$clone->rewind(); |
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return $clone; |
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} |
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/** |
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* Return the number of records in the collection. |
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* |
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* @return int |
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*/ |
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public function count(): int |
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{ |
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return $this->listeners->count(); |
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} |
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} |
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alex-patterson-webdev /
event-dispatcher
